[tor-bugs] #21565 [Applications/Tor Browser]: Clean up hardening wrapper flags in Gitian descriptors.

[Tor Bug Tracker & Wiki]

#21565: Clean up hardening wrapper flags in Gitian descriptors.
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     Reporter:  gk                        |      Owner:  tbb-team
         Type:  enhancement               |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-gitian
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 We set `export DEB_BUILD_HARDENING=1` to activate GCC hardening flags but
 we export other *HARDENING flags, too. The latter seems to be unnecessary
 as the former should already be activating all flags available. We should
 clean that up.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/21565>
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